7

ATS673LSE-DS

Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036

www.allegromicro.com

Allegro MicroSystems, Inc.

Self-Calibrating TPOS Gear Tooth Sensor Optimized for Automotive Cam Sensing Applications

ATS673 and ATS674

REFERENCE TARGET 8X

Characteristic

Symbol

Test Conditions

Typ.

Units

Symbol Key

Outside Diameter

Outside diameter of target

120

mm

Ø

F

Branded Face

of Sensor

Air Gap

Face Width

F

Breadth of tooth, with respect

to sensor

6mm

Circular Tooth Length

t

Length of tooth, with respect

23.6

mm

Circular Valley Length

Length of valley, with respect

23.6

mm

Tooth Whole Depth

5mm

Material

CRS 1018

–

–

Reference Target 8X

of Sensor

Branded Face

Reference Target (Gear) Information

Target/Gear Parameters for Correct TPOS Operation

For TPOS to function as specified, the target must generate a

minimum of 120 G difference between the magnetic field over

a tooth and the field over a valley, at the maximum installation

air gap. A target complying with the material and dimensions

cited for the reference target 8X, generates the required 120 G

differential.

The following recommendations should be followed in the

design and specification of targets:

• Tooth width, t ≥ 5 mm

• Tooth thickness, F ≥ 5 mm

Figure 1. Configuration with Reference Target